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Parse (Database Engine)

 

Applies To: SQL Server 2014, SQL Server 2016 Preview

Parse converts the canonical string representation of a hierarchyid to a hierarchyid value. Parse is called implicitly when a conversion from a string type to hierarchyid occurs. Acts as the opposite of ToString. Parse() is a static method.

Applies to: SQL Server (SQL Server 2012 through current version), Azure SQL Database.


-- Transact-SQL syntax
hierarchyid::Parse ( input )
-- This is functionally equivalent to the following syntax 
-- which implicitly calls Parse():
CAST ( input AS hierarchyid )

-- CLR syntax
static SqlHierarchyId Parse ( SqlString input ) 

input

Transact-SQL: The character data type value that is being converted.

CLR: The String value that is being evaluated.

SQL Server return type: hierarchyid

CLR return type: SqlHierarchyId

If Parse receives a value that is not a valid string representation of a hierarchyid, an exception is raised. For example, if char data types contain trailing spaces, an exception is raised.

The following code example uses ToString to convert a hierarchyid value to a string, and Parse to convert a string value to a hierarchyid.

DECLARE @StringValue AS nvarchar(4000), @hierarchyidValue AS hierarchyid
SET @StringValue = '/1/1/3/'
SET @hierarchyidValue = 0x5ADE

SELECT hierarchyid::Parse(@StringValue) AS hierarchyidRepresentation,
 @hierarchyidValue.ToString() AS StringRepresentation ;
GO

Here is the result set.

hierarchyidRepresentation StringRepresentation

------------------------- -----------------------

0x5ADE /1/1/3/

The following code snippet calls the Parse() method:

string input = “/1/2/”;
SqlHierarchyId.Parse(input);

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